Rackmount Stud Adapter Plate

Got a supposedly rack-mountable computer with mounting studs that prevent it from mounting in your rack? For example, the things marked red in the second photo are supposed to hold this computer, but they don't work with the lip on our rails. The green-marked part could hold it on our rails, but again the little red studs interfere. I'm sure Dell would not approve, but you can make this simple adapter to sit the unit on the lip of standard rails.